Mounting arrangement for coil bobbins



Oct. 8, 1963 J. E. ZERWIC MOUNTING ARRANGEMENT FOR con BOBBINS Filed April 27, 1960 INVENTOQ. Joseph E. Zerw/c 3,106,669 Patented Oct. 8, 1963 United States Patent Ofiflce MOUNTING ARRANGEMENT FQR COIL ROBBINS Joseph E. Zerwic, Chicago, 111., assignor to Automati Electric Laboratories, Inc, Northlake, Ill., :1 corporation of Delaware Filed Apr. 27, 1960, Ser. No. 24,930 4 Claims. (Cl. 317-158) My invention relates in general to mounting arrangements for coil bobbins, and more particularly, to an arrangement for securing a corewithin a molded coil bobbin.

Conventionally a core is secured Within a bobbin, for instance, by staking or by means of retaining washers. These known mounting arrangements, while generally satisfactory, require a particular operation and are at times unreliable as they are dependent upon the adequacy of the stake or the interference between the retaining washer and the core. Furthermore, the use of the conventional insulator pieces to insulate the heelpiece from the support member requires both assembly and fabrication operations and are thus a substantial cost element.

Therefore, it is an object of my invention to provide an arrangement for mounting a core within a coil bobbin, especially a molded coil bobbin which is more reliable and less costly than conventional arrangements.

Another object of my invention is to provide a novel and improved means for mounting a bobbin en a support member.

Another object of my inventionis to provide an arrangement for mounting an electromagnetic device wherein the heelpiece is insulated from the support member by the bobbin itself thereby eliminating the need for a separate insulator piece.

The preferred embodiment of my invention as disclosed here-in features an electromagnetic device with a molded bobbin having a recessed extension formed from the outside surface of a flange of the bobbin. This recess receives a heelpiece to which a core when positioned within the bobbin is mounted by means of a screw. By thus mounting the core to the heelpiece the core is se cured against movement within the bobbin. Furthermore, a portion of the heelpiece that would normally be in contact with the support member and therefore require an insulator piece, is insulated therefrom by it being enveloped by the extension formed on the flange which is of insulating material.

The principle of my invention, together with other objects and features thereof will become apparent from a perusal of the detailed description which follows. In the accompanying drawings:

FIG. 1 is an exploded perspective view showing the elements of an electromagnetic device according to my invention and how they are used with respect to each other.

FIG. 2 is an elevational view of this embodiment of my invention, a portion of the assembly being broken away to show the assembly in more detail.

FIG. 3 is a sectional view taken approximately along the line 3-3 of FIGURE 1.

Referring to FIGURE 1, reference character '10 designates a coil bobbin molded of plastic material, which, in combination with heelpiece 11 and core 12 forms part of an electromagnetic device such as a telephone relay. The heelpiece 11 and core 12 are insertable within the bobbin which is mountable .to the support member 13. This support member may be in the form of a relay mounting bracket or mounting plate.

More particularly, the bobbin 10 consists of: a tubular section 14 wherein core 12 is inserted and whereon coil 35 is wound, a flange 15 and 16 at each end of the tubular section 14, and a recessed extension 17 which is formed 2 on the heel end of flange 15 and receives heelpiece 11 within the recess. 3 I

This recessed extension extends outwardly from flange 15 as viewed along the longitudinal axis of the bobbin It] so as to permit positioning of heelpiece 11, when inserted within recess 32, transversely to inserted core 12 and parallel and adjacent to flange 15. The extension, fur.- thermore, includes three apertures 20, 21 and 22 through Which screws 23, 24 and 25 may be inserted, respectively. The aperture 22 for a screw 25 provides clearance for the head of screw 25'whereas apertures 20 and 21 provide clearance for the shafts of screws 23 and 24. Embossed ribs 26, FIG. 3, formed on extension 17'and projecting into recess 32 enable the heelpiece 11 to fit snugly within the recess, as showed in FIGURE 2. The resiliency of molded ribs 26 permits insertion of heelpiece 11 without interference between it and the walls of recess 32.

Referring to FIGURE 2, when the heelpiece 11 is positioned within recess 32 of extension 17, thereby restrained from any longitudinal movement, core 12 positioned within the tubular section 14 of the bobbin. 10 butts against heelpiece 11. In this position core 12 is mounted to heelpiece 11 with screw 25 inserted through aperture 22 of extension 17, through clearance hole 26 of heelpiece 11, and into tapped hole 31 of core 12. This mounting secures the core 12 within bobbin 10. The inserted core 12 prevents the heelpiece 11 from any transverse movement, heelpiece 11 prevents core 12 from any longitudinal movement, and the combination thereof prevents bobbinltl, core 12, and heelpiece 11 from any movement with respect to each other. When terminals 33, which are molded into flange 15, are inserted through clearance holes 34 in support member 13 the bobbin 10 may be mounted to support member 13 by screws 23 and 24 inserted through holes 29' and 30 of supportmember 13, through apertures 20 and 21 of extension 17, and into tapped holes 27 and 28 of heelpiece 11. Extension 17 thus also performs the function of insulating heelpiece 11 inserted in recess 32 from support member 13 by enveloping with molded insulating material that portion of heelpiece 11 that would otherwise be in contact with support member 13. The conventional separate insulator piece between heelpiece 11 and support member 13 is thereby eliminated.

My invention has been described in detail, however, it

is understood that the present disclosure has been made only by way of example and that numerous changes in the detail and structure may be made withoutdeparting from the scope of my invention as hereinafter claimed. For example, the invention may be practiced in connection with a coil bobbin other thanthat of an electromagnetic device, such as the bobbin of a resistance coil. In

this case, heelpiece 11 may be replaced by akey member of any other suitable shape or material, which is inserted in recess 32. -In such a case core 12 could be replaced by a stud or could be omitted, if desired.

What is claimed is:

l. A mounting arrangement comprising: an electromagnetic device having a heelpiece, a coil bobbin with at least one end flange, and a core within said bobbin; a support member; a recessed extension formed on said flange and receiving at least a portion of said heelpiece transversely to said core and parallel and adjacent to said flange; means positioned within the external surface of said extension locking said core to said heelpiece, and means mounting said heel-piece to said support member and clamping said recessed extension between said heelpiece and said support member.

2. A mounting arrangement as claimed in claim 1,

an aperture, an integrally molded coil bobbin with at least one end flange. a core positioned within said bobbin and having a tapped hole at one end thereof, an arrangement securing said core within said bobbin comprising: a recessed extension formed on said flange and receiving at least a portion of said heelpiece transversely to said core and parallel and adjacent to said flange; embossed ribs projecting from an inner surface of said recess insuring a snug fit of said portion; and a mounting screw extending through said aperture and into said tapped hole securing said core tosaid heelpiece and Within said bobbin.

4. In an electromagnetic device having a heelpicce, a coil bobbin With at least one end flange, and a core extending within said bobbin, an arrangement securing said core Within said bobbin comprising: a recessed extension formed on said flange and receiving at least a portion of said heelpiece transversely to said core and parallel and adjacent to said flange; means disposed on a surface of said recess insuring a snug fit of said heelpiece in said recess; and means positioned within the external surface of said extension locking said core to said heelpiece.

References iiitezl in the file of this patent UNITED STATES PATENTS 2,453,158

Price Nov. 9, 1948 2,632,071 Rinke Mar. 17, 1953 2,744,978 Romer May 8, 1956 2,889,497 Wolf et al. June 2, 1959 FOREIGN PATENTS 446,861 Italy Mar. 28, 1949 704,387 Great Britain Feb. 24, 1954 1,163,738 France Sept. 30, 1958 

1. A MOUNTING ARRANGEMENT COMPRISING: AN ELECTROMAGNETIC DEVICE HAVING A HEELPIECE, A COIL BOBBIN WITH AT LEAST ONE END FLANGE, AND A CORE WITHIN SAID BOBBIN; A SUPPORT MEMBER; A RECESSED EXTENSION FORMED ON SAID FLANGE AND RECEIVING AT LEAST A PORTION OF SAID HEELPIECE TRANSVERSELY TO SAID CORE AND PARALLEL AND ADJACENT TO SAID FLANGE; MEANS POSITIONED WITHIN THE EXTERNAL SURFACE OF SAID EXTENSION LOCKING SAID CORE TO SAID HEELPIECE, AND MEANS MOUNTING SAID HEELPIECE TO SAID SUPPORT MEMBER AND CLAMPING SAID RECESSED EXTENSION BETWEEN SAID HEELPIECE AND SAID SUPPORT MEMBER. 